A substance decays at a rate of 47.68% per hour. (a) Complete the boxes below to write a formula for the amount Q at hour t, where Qo is the initial amount. Do not round any values. Q = Qo•( Number (b) Find the half-life of the substance. Solve analytically and report your exact answer involving natural or common logarithms. t= Number years (Your answer contains a logarithm.) half-life. (c) Report an approximate answer of the half-life accurate to hours The half-life is approximately Number hours Interpretation: The substance decays by Number % by about every Number hours.

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